includes/api/ApiQueryTags.php

   1 <?php
   2 /**
   3  * API for MediaWiki 1.8+
   4  *
   5  * Created on Jul 9, 2009
   6  *
   7  * Copyright © 2009
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( 'ApiQueryBase.php' );
  30 }
  31
  32 /**
  33  * Query module to enumerate change tags.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryTags extends ApiQueryBase {
  38
  39         private $limit, $result;
  40         private $fld_displayname = false, $fld_description = false,
  41                         $fld_hitcount = false;
  42
  43         public function __construct( $query, $moduleName ) {
  44                 parent::__construct( $query, $moduleName, 'tg' );
  45         }
  46
  47         public function execute() {
  48                 $params = $this->extractRequestParams();
  49
  50                 $prop = array_flip( $params['prop'] );
  51
  52                 $this->fld_displayname = isset( $prop['displayname'] );
  53                 $this->fld_description = isset( $prop['description'] );
  54                 $this->fld_hitcount = isset( $prop['hitcount'] );
  55
  56                 $this->limit = $params['limit'];
  57                 $this->result = $this->getResult();
  58
  59                 $this->addTables( 'change_tag' );
  60                 $this->addFields( 'ct_tag' );
  61
  62                 if ( $this->fld_hitcount ) {
  63                         $this->addFields( 'count(*) AS hitcount' );
  64                 }
  65
  66                 $this->addOption( 'LIMIT', $this->limit + 1 );
  67                 $this->addOption( 'GROUP BY', 'ct_tag' );
  68                 $this->addWhereRange( 'ct_tag', 'newer', $params['continue'], null );
  69
  70                 $res = $this->select( __METHOD__ );
  71
  72                 $ok = true;
  73
  74                 while ( $row = $res->fetchObject() ) {
  75                         if ( !$ok ) {
  76                                 break;
  77                         }
  78                         $ok = $this->doTag( $row->ct_tag, $row->hitcount );
  79                 }
  80
  81                 // include tags with no hits yet
  82                 foreach ( ChangeTags::listDefinedTags() as $tag ) {
  83                         if ( !$ok ) {
  84                                 break;
  85                         }
  86                         $ok = $this->doTag( $tag, 0 );
  87                 }
  88
  89                 $this->result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'tag' );
  90         }
  91
  92         private function doTag( $tagName, $hitcount ) {
  93                 static $count = 0;
  94                 static $doneTags = array();
  95
  96                 if ( in_array( $tagName, $doneTags ) ) {
  97                         return true;
  98                 }
  99
 100                 if ( ++$count > $this->limit ) {
 101                         $this->setContinueEnumParameter( 'continue', $tagName );
 102                         return false;
 103                 }
 104
 105                 $tag = array();
 106                 $tag['name'] = $tagName;
 107
 108                 if ( $this->fld_displayname ) {
 109                         $tag['displayname'] = ChangeTags::tagDescription( $tagName );
 110                 }
 111
 112                 if ( $this->fld_description ) {
 113                         $msg = wfMsg( "tag-$tagName-description" );
 114                         $msg = wfEmptyMsg( "tag-$tagName-description", $msg ) ? '' : $msg;
 115                         $tag['description'] = $msg;
 116                 }
 117
 118                 if ( $this->fld_hitcount ) {
 119                         $tag['hitcount'] = $hitcount;
 120                 }
 121
 122                 $doneTags[] = $tagName;
 123
 124                 $fit = $this->result->addValue( array( 'query', $this->getModuleName() ), null, $tag );
 125                 if ( !$fit ) {
 126                         $this->setContinueEnumParameter( 'continue', $tagName );
 127                         return false;
 128                 }
 129
 130                 return true;
 131         }
 132
 133         public function getCacheMode( $params ) {
 134                 return 'public';
 135         }
 136
 137         public function getAllowedParams() {
 138                 return array(
 139                         'continue' => array(
 140                         ),
 141                         'limit' => array(
 142                                 ApiBase::PARAM_DFLT => 10,
 143                                 ApiBase::PARAM_TYPE => 'limit',
 144                                 ApiBase::PARAM_MIN => 1,
 145                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 146                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 147                         ),
 148                         'prop' => array(
 149                                 ApiBase::PARAM_DFLT => 'name',
 150                                 ApiBase::PARAM_TYPE => array(
 151                                         'name',
 152                                         'displayname',
 153                                         'description',
 154                                         'hitcount'
 155                                 ),
 156                                 ApiBase::PARAM_ISMULTI => true
 157                         )
 158                 );
 159         }
 160
 161         public function getParamDescription() {
 162                 return array(
 163                         'continue' => 'When more results are available, use this to continue',
 164                         'limit' => 'The maximum number of tags to list',
 165                         'prop' => array(
 166                                 'Which properties to get',
 167                                 ' name         - Adds name of tag',
 168                                 ' displayname  - Adds system messsage for the tag',
 169                                 ' description  - Adds description of the tag',
 170                                 ' hitcount     - Adds the amount of revisions that have this tag',
 171                         ),
 172                 );
 173         }
 174
 175         public function getDescription() {
 176                 return 'List change tags';
 177         }
 178
 179         protected function getExamples() {
 180                 return array(
 181                         'api.php?action=query&list=tags&tgprop=displayname|description|hitcount'
 182                 );
 183         }
 184
 185         public function getVersion() {
 186                 return __CLASS__ . ': $Id$';
 187         }
 188 }